★ Must-know
Matter is classified as pure substances or mixtures.
A homogeneous mixture has uniform composition, whereas a heterogeneous mixture has distinguishable components or phases.
Extensive properties depend on the amount of matter, whereas intensive properties do not; mass and volume are extensive, while density, temperature, and phase-change points are intensive.
Further detail
📌 Qualitative properties are described without numerical measurement, whereas quantitative properties are expressed through measurement.
Pure substances have fixed composition, whereas mixtures contain combined components.
1. Which classification describes matter that has a fixed composition?
2. What distinguishes an element from a compound?
3. Which substance is classified as a compound because it contains chemically joined elements?
How is matter classified?
Matter is classified as pure substances or mixtures.
What defines an element?
An element contains only one type of atom.
What defines a compound?
A compound contains two or more elements chemically joined.
What distinguishes a homogeneous mixture?
It has uniform composition.
What distinguishes a heterogeneous mixture?
It has distinguishable components or phases.
How do qualitative properties differ from quantitative?
Qualitative properties are described without numerical measurement.
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